Results 51 to 60 of about 1,055 (183)

New geomagnetic field observations in the South Atlantic Anomaly region

Annals of Geophysics, 2009
Three new geomagnetic observatories have been established recently around the South Atlantic geomagnetic<br />Anomaly by GeoForschungsZentrum Potsdam(GFZ), Germany, in collaboration with other institutions.
Pieter Kotzé, Anne Hemshorn, Hans-Joachim Linthe, Mioara Mandea, Monika Korte, Edgard Ricaldi   +5 more
doaj   +1 more source

Protection against lightning at a geomagnetic observatory [PDF]

Geoscientific Instrumentation, Methods and Data Systems, 2014
Abstract. The Sinji Vrh Geomagnetic Observatory was built on the brow of Gora, the mountain above Ajdovščina, which is a part of Trnovo plateau, and all over Europe one can hardly find an area which is more often struck by lightning than this southwestern part of Slovenia.
R. Čop, G. Milev, D. Deželjin, J. Kosmač   +3 more
openaire   +3 more sources

Near‐Earth Cosmic Ray Modulation Index ϕ and Neutron Monitor Cutoff Rigidities at Hourly Cadence: Toward an Improved Monitoring of Solar‐Terrestrial Radiation Environment, Space Weather, and Space Climate

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Cosmic rays (CRs) are energetic particles originating from galactic and extragalactic sources. When arriving into the solar system and the Sun's heliosphere, they are diverted and modulated by the magnetic activity of the Sun. This modulation can be quantified by the modulation parameter ϕ $\phi $ determined with the Force‐field approximation (
Pauli Väisänen, Nicholas Larsen, Sergey Koldobskiy, Markus Similä, David Pelosi, Miguel Orcinha   +5 more
wiley   +1 more source

A sign of the dayside current wedge in geomagnetic observations at Stará Ďala (present-day Hurbanovo) on 16 April 1938

Contributions to Geophysics and Geodesy
The recently proposed dayside current wedge likely explains the mechanism behind the well-known Carrington geomagnetic storm on 2 September 1859, as well as an event observed in Europe on 29 October 2003. Both events were swift and intense, had unusually
Eduard KOČI, Fridrich VALACH
doaj   +1 more source

ITalian Geomagnetic Reference Field (ITGRF): update for 2000 and secular variation model up to 2005 by autoregressive forecasting

Annals of Geophysics, 2003
The updated version of the ITalian Geomagnetic Reference Field (ITGRF) for 2000.0 and its secular variation model up to 2005.0 are presented in this paper.
J. M. Torta, A. Meloni, G. Dominici, L. Gaya-Piqué, A. De Santis, R. Tozzi   +5 more
doaj   +1 more source

Fundamental Poloidal Wave Event Extending From Midnight to Dawn

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Fundamental poloidal (P1) waves are a class of magnetospheric standing Alfvén waves characterized by field line oscillations in the meridional plane. P1 waves are infrequently excited in the ring current region and are believed to be the source of giant pulsations (Pgs) observed on the ground. Pgs are mostly detected on the morning side with a
Kazue Takahashi, Michael D. Hartinger, Kiyokazu Koga   +2 more
wiley   +1 more source

Secular trends in storm-level geomagnetic activity [PDF]

Annales Geophysicae, 2011
Analysis is made of K-index data from groups of ground-based geomagnetic observatories in Germany, Britain, and Australia, 1868.0–2009.0, solar cycles 11–23.
J. J. Love
doaj   +1 more source

Predicting Geomagnetic Activity in the Ascending and Declining Phases of the Solar Cycle

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Most predictions of space climate, that is, the long‐term behavior of the solar‐terrestrial environment, have focused on forecasting the 11‐year sunspot cycle. Geomagnetic activity, on the other hand, has mainly been predicted in shorter, space weather timescales of up to days to weeks.
Timo Qvick, Timo Asikainen, Kalevi Mursula   +2 more
wiley   +1 more source

Real‐Time Prediction of Two Geomagnetic Storms Using Solar Orbiter as a Far Upstream Solar Wind Monitor

Space Weather, Volume 24, Issue 8, August 2026.
Abstract We present the first real‐time predictions of coronal mass ejection (CME) magnetic structure and resulting geomagnetic impact at Earth for two events using far‐upstream observations from Solar Orbiter during March 2024. While our approach assumes idealized conditions for CME propagation and scaling, in situ magnetic field data from upstream ...
Emma E. Davies, Eva Weiler, Christian Möstl, Satabdwa Majumdar, Hannah T. Rüdisser, Timothy S. Horbury, Helen O'Brien, Jean Morris, Alastair Crabtree   +8 more
wiley   +1 more source

Alfvénic Poynting Flux Characterized by a Substorm‐SMC Cycle and Ionospheric Influence

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Geomagnetic substorms are fundamental processes of explosive geospace energy release within the Earth's magnetotail, which are usually divided into three phases: the growth phase, the expansion phase, and the recovery phase. Large‐scale electromagnetic energy transport during a geomagnetic substorm is in the form of Alfvén waves, transmitting ...
Qianfeng Yin, Enhao Feng, Binzheng Zhang, William Lotko, Kevin Pham, Zhiqi Zheng, Ziyi Yang, Tong Dang, Huishan Fu, Oliver Brambles   +9 more
wiley   +1 more source